EP1158145A2 - Assembly for controlling the regeneration of a NOx-absorber catalyst within an exhaust gas line of an internal combustion engine - Google Patents

Assembly for controlling the regeneration of a NOx-absorber catalyst within an exhaust gas line of an internal combustion engine Download PDF

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Publication number
EP1158145A2
EP1158145A2 EP01109821A EP01109821A EP1158145A2 EP 1158145 A2 EP1158145 A2 EP 1158145A2 EP 01109821 A EP01109821 A EP 01109821A EP 01109821 A EP01109821 A EP 01109821A EP 1158145 A2 EP1158145 A2 EP 1158145A2
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EP
European Patent Office
Prior art keywords
oxygen
regeneration
monolith
exhaust gas
nox storage
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP01109821A
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German (de)
French (fr)
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EP1158145A3 (en
EP1158145B1 (en
Inventor
Stefan Detterbeck
Stephan Ramatschi
Peter Müller
Hanns-Christian Dr. Hasenclever
Florian Preuss
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Bayerische Motoren Werke AG
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Bayerische Motoren Werke AG
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Publication of EP1158145A3 publication Critical patent/EP1158145A3/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
    • F01N3/0842—Nitrogen oxides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/008—Mounting or arrangement of exhaust sensors in or on exhaust apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0814—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with catalytic converters, e.g. NOx absorption/storage reduction catalysts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2510/00—Surface coverings
    • F01N2510/06—Surface coverings for exhaust purification, e.g. catalytic reaction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/14—Nitrogen oxides
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Definitions

  • the invention relates to a preamble of claim 1 Device for controlling the regeneration of a NOx storage catalytic converter in the exhaust tract of an internal combustion engine, which caused with rich exhaust gas Regeneration of the NOx storage cat arranged as a monolith in a housing by means of an oxygen probe provided downstream of this over which the low-oxygen, rich exhaust gas is controlled / regulated ended.
  • DE 198 44 082 C1 describes a method for regenerating a NOx storage catalytic converter known, whereby for consumption and emission-optimal regeneration a NOx storage catalytic converter for a lean-burn internal combustion engine in particular the concentration of regeneration agents such as carbon monoxide (CO) and hydrocarbons (HC), depending on a signal downstream of the NOx catalyst arranged oxygen probe during the regeneration phase is changed. They are changed during a fat peak the proportions of rich mixture of the internal combustion engine between two lean areas gradually towards lean mixture to with the associated Minimizing the regeneration agent breakthrough breakthrough or to minimize the regeneration agent slip.
  • CO carbon monoxide
  • HC hydrocarbons
  • the invention has for its object a generic device with respect minimizing regeneration breakthrough without an additional one Further training control and regulation effort.
  • the advantage of the invention is that towards the end of the regeneration phase NOx storage catalyst excess regeneration agent with the three-way coating be safely oxidized, the probe at the same time over the invention intended inactive zone in the monolith of the NOx storage catalyst such a low-oxygen and thus rich exhaust gas is supplied that the Probe a signal to switch from a rich mixture to a lean mixture Internal combustion engine supplies.
  • the earlier changeover to a lean mixture of the internal combustion engine is advantageously related to a reductant breakthrough the emission of rich exhaust gas from the internal combustion engine Ended earlier, significantly reducing a breakthrough.
  • the inactive zone is preferred a recess from a substantially the extent of the three-way coating corresponding depth in the exhaust gas flow direction.
  • a proposal relates to the fact that Recess on the circumference of a particularly cylindrical monolith an opening causes a stop arranged in / on the housing to engage. With this Design is the assignment of recess and oxygen probe secured.
  • the recess be an annular groove a central, essentially cylindrical extension is designed.
  • a device 1 for controlling the regeneration of a NOx storage catalytic converter 2 in the exhaust line of an internal combustion engine (not shown) regeneration of the monolith 3 in a housing 4 with rich exhaust gas arranged NOx storage cat 2 by means of a downstream of it Oxygen probe 5 controlled / regulated ended via the low-oxygen, rich exhaust gas.
  • the NOx storage cat 2 in the downstream end region 6 a three-way coating 7 with a relatively high oxygen storage capacity has and the oxygen probe 5 in / on the housing 4 of the free End face 8 of the downstream end region 6 is arranged relatively closely adjacent , upstream in projection of the oxygen probe 5 from the free end face 8 in the downstream end region 6 of the monolith 3 the conversion path the three-way coating 7 shortening recess 9 as a catalytic inactive zone 9 'is arranged.
  • the monolith 3 of the NOx storage cat 2 in the downstream End region 6 also have uncoated honeycomb sections, not shown to form a catalytically inactive zone 9 '.
  • the oxygen probe which is preferably designed as a jump probe in the temporal end area of the regeneration phase of the NOx storage catalytic converter 2 detects a breakthrough in rich exhaust gas at an early stage and Regeneration operation controlled triggered fat peak ended in time, that a wake of rich exhaust gas in the exhaust pipe upstream of the NOx storage catalytic converter at the end of the regeneration phase by switching to lean mixture the internal combustion engine avoided a breakthrough in regeneration agents is.
  • the invention also achieves that the NOx storage cat 2 after a probe jump is driven for a certain amount of time in fat and so does the lower one Storage layers converted converted NOx and the storage cat 2 in is essentially fully regenerated.
  • the respective recess 9 has an im essentially the extent of the three-way coating 7 in the exhaust gas flow direction appropriate depth.
  • the recess 9 causes an opening on the circumference of the monolith 3 10 for engaging a stop (not shown) arranged in / on the housing 4, provided, for example, as a dent in the housing 4 can be.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

A downstream end (6) of a nitrogen oxide (NOx) storage catalyst has a three-way coating (7) with a relatively high oxygen storage capacity. The oxygen sensor (5) is located relatively closely to the open end face (8) of the region. Immediately upstream of the oxygen sensor, in flow alignment with it, and in the downstream end of the monolith (3), the catalyst is shortened, leaving a catalytically inactive zone (9').

Description

Die Erfindung bezieht sich nach dem Oberbegriff des Patentanspruches 1 auf eine Vorrichtung zur Steuerung/Regelung der Regeneration eines NOx-Speicherkatalysators im Abgasstrang einer Brennkraftmaschine, wobei die mit fettem Abgas bewirkte Regeneration des als Monolithen in einem Gehäuse angeordneten NOx-Speicherkats mittels einer stromab von diesem vorgesehenen Sauerstoff-Sonde über das sauerstoffarme, fette Abgas gesteuert/geregelt beendet ist.The invention relates to a preamble of claim 1 Device for controlling the regeneration of a NOx storage catalytic converter in the exhaust tract of an internal combustion engine, which caused with rich exhaust gas Regeneration of the NOx storage cat arranged as a monolith in a housing by means of an oxygen probe provided downstream of this over which the low-oxygen, rich exhaust gas is controlled / regulated ended.

Aus der DE 198 44 082 C1 ist ein Verfahren zum Regenerieren eines NOx-Speicherkatalysators bekannt, wobei zur verbrauchs- und emissionsoptimalen Regeneration eines NOx-Speicherkatalysators für eine insbesondere Mager-Brennkraftmaschine die Konzentration der Regenerierungsmittel, wie Kohlenmonoxid (CO) und Kohlenwasserstoffe (HC), in Abhängigkeit eines Signals einer stromab des NOx-Katalysators angeordneten Sauerstoff-Sonde während der Regenerationsphase verändert wird. Verändert werden hierbei während einer Fett-Spitze zwischen zwei Magerbereichen die Anteile an fettem Gemisch der Brennkraftmaschine schrittweise in Richtung mageres Gemisch, um mit der damit verbundenen Minimierung der Regenerationsmittel einen Regenerationsmitteldurchbruch bzw. eine Minimierung des Regenerationsmittelschlupfes zu erreichen. DE 198 44 082 C1 describes a method for regenerating a NOx storage catalytic converter known, whereby for consumption and emission-optimal regeneration a NOx storage catalytic converter for a lean-burn internal combustion engine in particular the concentration of regeneration agents such as carbon monoxide (CO) and hydrocarbons (HC), depending on a signal downstream of the NOx catalyst arranged oxygen probe during the regeneration phase is changed. They are changed during a fat peak the proportions of rich mixture of the internal combustion engine between two lean areas gradually towards lean mixture to with the associated Minimizing the regeneration agent breakthrough breakthrough or to minimize the regeneration agent slip.

Der Erfindung liegt die Aufgabe zugrunde, eine gattungsgemäße Vorrichtung bezüglich der Minimierung eines Regenerationsmitteldurchbruches ohne einen zusätzlichen Steuerungs-/Regelungsaufwand weiterzubilden.The invention has for its object a generic device with respect minimizing regeneration breakthrough without an additional one Further training control and regulation effort.

Diese Aufgabe ist mit dem Patentanspruch 1 dadurch gelöst, dass der NOx-Speicherkat im stromabseitigen Endbereich eine Dreiwegebeschichtung mit einer relativ hohen Sauerstoff-Speicherfähigkeit aufweist und die Sauerstoff-Sonde im/am Gehäuse der freien Stirnseite des stromabseitigen Endbereiches relativ eng benachbart angeordnet ist, wobei in Projektion der Sauerstoff-Sonde stromauf von der freien Stirnseite aus im stromabseitigen Endbereich des Monolithen eine die Konvertierungsstrecke der Dreiwegebeschichtung verkürzende, katalytisch inaktive Zone angeordnet ist.This object is achieved with claim 1 in that the NOx storage cat in the downstream end area a three-way coating with a relative has high oxygen storage capacity and the oxygen probe in / on the housing relatively close to the free end face of the downstream end region is arranged, in projection of the oxygen probe upstream from the the front end in the downstream end area of the monolith the three-way coating foreshortening, catalytically inactive Zone is arranged.

Der Vorteil der Erfindung liegt darin, dass gegen Ende der Regenerationsphase des NOx-Speicherkatalysators überschüssige Regenerationsmittel mit der Dreiwegebeschichtung sicher aufoxidiert werden, wobei der Sonde zugleich über die erfindungsgemäß vorgesehene inaktive Zone im Monolithen des NOx-Speicherkatalysators ein derart sauerstoffarmes und damit fettes Abgas zugeführt wird, dass die Sonde ein Signal zur Umstellung von fettem Gemisch auf mageres Gemisch der Brennkraftmaschine liefert. Mit der erfindungsgemäß früheren Umsteuerung auf ein mageres Gemisch der Brennkraftmaschine ist in vorteilhafter Weise in Bezug auf einen Reduktionsmittel-Durchbruch der Ausstoß an fettem Abgas der Brennkraftmaschine früher beendet und damit ein Durchbruch wesentlich reduziert.The advantage of the invention is that towards the end of the regeneration phase NOx storage catalyst excess regeneration agent with the three-way coating be safely oxidized, the probe at the same time over the invention intended inactive zone in the monolith of the NOx storage catalyst such a low-oxygen and thus rich exhaust gas is supplied that the Probe a signal to switch from a rich mixture to a lean mixture Internal combustion engine supplies. With the earlier changeover to a lean mixture of the internal combustion engine is advantageously related to a reductant breakthrough the emission of rich exhaust gas from the internal combustion engine Ended earlier, significantly reducing a breakthrough.

In Ausgestaltung der Erfindung wird vorgeschlagen, dass die inaktive Zone vorzugsweise eine Ausnehmung von einer im wesentlichen der Erstreckung der Dreiwegebeschichtung in Abgas-Strömungsrichtung entsprechende Tiefe ist.In an embodiment of the invention it is proposed that the inactive zone is preferred a recess from a substantially the extent of the three-way coating corresponding depth in the exhaust gas flow direction.

Der Vorteil dieser Ausgestaltung ist darin zu sehen, dass mit der erfindungsgemäßen Ausnehmung von entsprechender Tiefe im Endbereich des NOx-Speicherkats eine das fette Abgas nicht konvertierende Zone geschaffen ist zur Auslösung eines Steuersignals. Die Tiefe der Ausnehmung ist dabei so gewählt, dass bei zu Ende gehender Regenerationsphase ohne Durchbruch der Reduktionsmittel mit der Ausnehmung ein gezielter, lokal begrenzter Durchbruch zur Ansteuerung der Sauerstoff-Sonde dient für einen frühzeitigen bzw. rechtzeitigen Abbruch der sauerstoffarmen Fettspitze mit Übergang in den Magerbetrieb der Brennkraftmaschine.The advantage of this configuration can be seen in the fact that with the invention Recess of corresponding depth in the end area of the NOx storage cat a zone that does not convert the rich exhaust gas is created for triggering a control signal. The depth of the recess is chosen so that at the end of the regeneration phase without breakthrough of the reducing agents the recess a targeted, locally limited breakthrough to control the Oxygen probe is used for early or timely termination of the low-oxygen Grease tip with transition to lean operation of the internal combustion engine.

In weiterer Ausgestaltung der Erfindung bezieht sich ein Vorschlag darauf, dass die Ausnehmung am Umfang eines insbesondere zylindrischen Monolithen eine Öffnung bewirkt zum Eingriff eines im/am Gehäuse angeordneten Anschlages. Mit dieser Ausgestaltung ist die Zuordnung von Ausnehmung und Sauerstoff-Sonde gesichert.In a further embodiment of the invention, a proposal relates to the fact that Recess on the circumference of a particularly cylindrical monolith an opening causes a stop arranged in / on the housing to engage. With this Design is the assignment of recess and oxygen probe secured.

Bezüglich einer vorteilhaften Fertigung eines erfindungsgemäß gestalteten Monolithen wird im weiteren vorgeschlagen, dass die Ausnehmung als eine Ringnut um einen zentrischen, im wesentlichen zylindrischen Fortsatz gestaltet ist.With regard to an advantageous production of a monolith designed according to the invention it is further proposed that the recess be an annular groove a central, essentially cylindrical extension is designed.

Die Erfindung ist anhand von in der Zeichnung dargestellten Ausführungsbeispielen beschrieben. Es zeigt

Figur 1
eine Stirnansicht eines NOx-Speicherkatalysators mit im Gehäuse angeordneter Sauerstoff-Sonde und einer zugeordneten Ausnehmung,
Figur 2
den Katalysator nach Figur 1 in einen abschnittsweisen Längsschnitt gemäß der Linie II-II,
Figur 3
einen NOx-Speicherkat in einem abschnittsweisen Längsschnitt mit einer als Ringnut gestalteten Ausnehmung, und
Figur 4
einen NOx-Speicherkat in einem abschnittsweisen Längsschnitt mit einer Ausnehmung, die am Umfang des Monolithen eine Öffnung bewirkt.
The invention is described with reference to exemplary embodiments shown in the drawing. It shows
Figure 1
2 shows an end view of a NOx storage catalytic converter with an oxygen probe arranged in the housing and an associated recess,
Figure 2
1 in a sectional longitudinal section along the line II-II,
Figure 3
a NOx storage cat in a sectional longitudinal section with a recess designed as an annular groove, and
Figure 4
a NOx storage cat in a sectional longitudinal section with a recess which causes an opening on the circumference of the monolith.

In einer Vorrichtung 1 zur Steuerung/Regelung der Regeneration eines NOx-Speicherkatalysators 2 im nicht gezeigten Abgasstrang einer Brennkraftmaschine ist die mit fettem Abgas bewirkte Regeneration des als Monolithen 3 in einem Gehäuse 4 angeordneten NOx-Speicherkats 2 mittels einer stromab von diesem vorgesehenen Sauerstoff-Sonde 5 über das sauerstoffarme, fette Abgas gesteuert/geregelt beendet.In a device 1 for controlling the regeneration of a NOx storage catalytic converter 2 in the exhaust line of an internal combustion engine (not shown) regeneration of the monolith 3 in a housing 4 with rich exhaust gas arranged NOx storage cat 2 by means of a downstream of it Oxygen probe 5 controlled / regulated ended via the low-oxygen, rich exhaust gas.

Um diese Vorrichtung 1 bezüglich der Minimierung eines Regenerationsmitteldurchbruches ohne einen zusätzlichen Steuerungs-/Regelungsaufwand weiterzubilden wird vorgeschlagen, dass der NOx-Speicherkat 2 im stromabseitigen Endbereich 6 eine Dreiwegebeschichtung 7 mit einer relativ hohen Sauerstoff-Speicherfähigkeit aufweist und die Sauerstoff-Sonde 5 im/am Gehäuse 4 der freien Stirnseite 8 des stromabseitigen Endbereiches 6 relativ eng benachbart angeordnet ist, wobei stromauf in Projektion der Sauerstoff-Sonde 5 von der freien Stirnseite 8 aus im stromabseitigen Endbereich 6 des Monolithen 3 eine die Konvertierungsstrecke der Dreiwegebeschichtung 7 verkürzende Ausnehmung 9 als eine katalytisch inaktive Zone 9' angeordnet ist.To this device 1 in terms of minimizing a regenerant breakthrough without further training it is proposed that the NOx storage cat 2 in the downstream end region 6 a three-way coating 7 with a relatively high oxygen storage capacity has and the oxygen probe 5 in / on the housing 4 of the free End face 8 of the downstream end region 6 is arranged relatively closely adjacent , upstream in projection of the oxygen probe 5 from the free end face 8 in the downstream end region 6 of the monolith 3 the conversion path the three-way coating 7 shortening recess 9 as a catalytic inactive zone 9 'is arranged.

Anstelle der Ausnehmung 9 kann der Monolith 3 des NOx-Speicherkats 2 im stromabseitigen Endbereich 6 auch unbeschichtete, nicht gezeigte Wabenabschnitte aufweisen zur Ausbildung einer katalytisch inaktiven Zone 9'.Instead of the recess 9, the monolith 3 of the NOx storage cat 2 in the downstream End region 6 also have uncoated honeycomb sections, not shown to form a catalytically inactive zone 9 '.

Mit jeder der vorbeschriebenen erfindungsgemäßen Ausgestaltungen einer inaktiven Zone 9' ist erreicht, dass die vorzugsweise als Sprungsonde ausgebildete Sauerstoff-Sonde im zeitlichen Endbereich der Regenerationsphase des NOx-Speicherkatalysators 2 frühzeitig einen Durchbruch an fettem Abgas erkennt und die für den Regenerationsbetrieb gesteuert ausgelöste Fettspitze derart rechtzeitig beendet, dass ein Nachlauf an fettem Abgas in der Abgasleitung vor dem NOx-Speicherkatalysator mit Beendigung der Regenerationsphase durch Umstellung auf Magergemisch der Brennkraftmaschine ein Durchbruch an Regenerationsmitteln vermieden ist. With each of the above-described embodiments of an inactive Zone 9 'is reached that the oxygen probe, which is preferably designed as a jump probe in the temporal end area of the regeneration phase of the NOx storage catalytic converter 2 detects a breakthrough in rich exhaust gas at an early stage and Regeneration operation controlled triggered fat peak ended in time, that a wake of rich exhaust gas in the exhaust pipe upstream of the NOx storage catalytic converter at the end of the regeneration phase by switching to lean mixture the internal combustion engine avoided a breakthrough in regeneration agents is.

Mit der Erfindung ist aber auch erreicht, dass der NOx-Speicherkat 2 nach Sondensprung noch eine gewisse Zeit fett gefahren wird und so auch das in den tiefer liegenden Speicherschichten eingelagerte NOx konvertiert und der Speicherkat 2 im wesentlichen voll regeneriert wird.However, the invention also achieves that the NOx storage cat 2 after a probe jump is driven for a certain amount of time in fat and so does the lower one Storage layers converted converted NOx and the storage cat 2 in is essentially fully regenerated.

Insbesondere gemäß den Figuren 2 und 4 weist die jeweilige Ausnehmung 9 eine im wesentlichen der Erstreckung der Dreiwegebeschichtung 7 in Abgas-Strömungsrichtung entsprechende Tiefe auf. Mit diesen Ausgestaltungen ist sichergestellt, dass der Sauerstoff-Sonde 5 gegen Beendigung der NOx- Regenerationsphase ausreichend sauerstoffarmes Abgas zugeleitet wird.In particular according to FIGS. 2 and 4, the respective recess 9 has an im essentially the extent of the three-way coating 7 in the exhaust gas flow direction appropriate depth. These configurations ensure that the oxygen probe 5 against completion of the NOx regeneration phase sufficient oxygen-poor exhaust gas is supplied.

Gemäß Figur 4 bewirkt die Ausnehmung 9 am Umfang des Monolithen 3 eine Öffnung 10 zum Eingriff eines im/am Gehäuse 4 angeordneten, nicht gezeigten Anschlages, der beispielsweise als eine im Gehäuse 4 ausgebildete Delle vorgesehen sein kann.According to Figure 4, the recess 9 causes an opening on the circumference of the monolith 3 10 for engaging a stop (not shown) arranged in / on the housing 4, provided, for example, as a dent in the housing 4 can be.

Für eine kostengünstige Herstellung bzw. Fertigung des Monolithen 3 ist gemäß Figur 3 vorgesehen, dass die Ausnehmung 9 als eine Ringnut 11 um einen zentrischen, im wesentlichen zylindrischen Fortsatz 12 gestaltet ist.For an inexpensive manufacture or manufacture of the monolith 3 is according to Figure 3 provided that the recess 9 as an annular groove 11 around a central, is essentially cylindrical extension 12 is designed.

Mit der erfindungsgemäßen Vorrichtung 1 erübrigt sich ein gesonderter, nachgeschalteter Dreiwegekat, es ergibt sich eine hohe Emissionssicherheit bei maximaler Ausnutzung der Speicherkapazität des NOx-Speicherkats durch eine Vollregeneration und im übrigen ergibt sich bei einer direkt einspritzenden Brennkraftmaschine auch ein Verbrauchsvorteil.With the device 1 according to the invention, a separate, downstream one is not necessary Three-way cat, there is a high emission security at maximum Utilization of the storage capacity of the NOx storage cat through a full regeneration and otherwise results in a direct injection internal combustion engine also a consumption advantage.

Claims (6)

Vorrichtung zur Steuerung/Regelung der Regeneration eines NOx-Speicherkatalysators im Abgasstrang einer Brennkraftmaschine, wobei die mit fettem Abgas bewirkte Regeneration des als Monolithen (3) in einem Gehäuse (4) angeordneten NOx-Speicherkats (2) mittels einer stromab von diesem vorgesehenen Sauerstoff-Sonde (5) über das sauerstoffarme, fette Abgas gesteuert/geregelt beendet ist, dadurch gekennzeichnet, dass der NOx-Speicherkat (2) im stromabseitigen Endbereich (6) eine Dreiwegebeschichtung (7) mit einer relativ hohen Sauerstoff-Speicherfähigkeit aufweist und die Sauerstoff-Sonde (5) im/am Gehäuse (4) der freien Stirnseite (8) des stromabseitigen Endbereiches (6) relativ eng benachbart angeordnet ist, wobei stromauf in Projektion der Sauerstoff-Sonde (5) von der freien Stirnseite (8) aus im stromabseitigen Endbereich (6) des Monolithen (3) eine die Konvertierungsstrecke der Dreiwegebeschichtung (7) verkürzende,katalytisch inaktive Zone (9') angeordnet ist. Device for controlling / regulating the regeneration of a NOx storage catalytic converter in the exhaust line of an internal combustion engine, The regeneration of the NOx storage cat (2) arranged as a monolith (3) in a housing (4), which is effected with rich exhaust gas, is terminated in a controlled manner by means of an oxygen probe (5) provided downstream thereof via the low-oxygen, rich exhaust gas, characterized, that the NOx storage cat (2) in the downstream end region (6) has a three-way coating (7) with a relatively high oxygen storage capacity and the oxygen probe (5) in / on the housing (4) of the free end face (8) of the downstream end region (6) is arranged relatively closely adjacent, wherein upstream in projection of the oxygen probe (5) from the free end face (8) in the downstream end region (6) of the monolith (3) a catalytically inactive zone (9 ') shortening the conversion distance of the three-way coating (7) is arranged. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die inaktive Zone (9') eine Ausnehmung (9) von einer im wesentlichen der Erstreckung der Dreiwegebeschichtung (7) entsprechenden Tiefe ist.Device according to claim 1, characterized in that the inactive zone (9 ') is a recess (9) of a depth substantially corresponding to the extent of the three-way coating (7). Vorrichtung nach Anspruch 1 und 2, dadurch gekennzeichnet, dass die Ausnehmung (9) am Umfang des Monolithen (3) eine Öffnung (10) bewirkt zum Eingriff eines im/am Gehäuse (4) angeordneten Anschlages.Device according to claims 1 and 2, characterized in that the recess (9) on the circumference of the monolith (3) creates an opening (10) for engaging a stop arranged in / on the housing (4). Vorrichtung nach Anspruch 1 und 2, dadurch gekennzeichnet, dass die Ausnehmung (9) als eine Ringnut (11) um einen zentrischen, im wesentlichen zylindrischen Fortsatz (12) gestaltet ist.Device according to claims 1 and 2, characterized in that the recess (9) is designed as an annular groove (11) around a central, essentially cylindrical extension (12). Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Sauerstoff- bzw. Lambda-Sonde (5) eine Sprungsonde ist.Device according to one of claims 1 to 4, characterized in that the oxygen or lambda probe (5) is a step probe. Vorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass der Monolith (3) des NOx-Speicherkats (2) im stromabseitigen Endbereich (6) unbeschichtete Wabenabschnitte als inaktive Zone (9') aufweist.Device according to one of claims 1 to 5, characterized in that the monolith (3) of the NOx storage cat (2) in the downstream end region (6) has uncoated honeycomb sections as an inactive zone (9 ').
EP01109821A 2000-05-20 2001-04-21 Assembly for controlling the regeneration of a NOx-absorber catalyst within an exhaust gas line of an internal combustion engine Expired - Lifetime EP1158145B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10025076A DE10025076B4 (en) 2000-05-20 2000-05-20 Device for controlling / regulating the regeneration of a NOx storage catalyst in the exhaust system of an internal combustion engine
DE10025076 2000-05-20

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EP1158145A2 true EP1158145A2 (en) 2001-11-28
EP1158145A3 EP1158145A3 (en) 2005-09-28
EP1158145B1 EP1158145B1 (en) 2007-03-21

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FR2945315A3 (en) * 2009-05-05 2010-11-12 Renault Sas Exhaust gas treating device i.e. particle filter, for engine of motor vehicle, has bars whose end face is located far away from common plane over entire extent of its section so as to form indention in inlet or outlet face of array
US8649854B2 (en) 2008-02-06 2014-02-11 Capis Sprl Method and device for the determination of murmur frequency band
FR3091556A1 (en) * 2019-01-09 2020-07-10 Renault S.A.S vehicle depollution system

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DE102004012159A1 (en) * 2004-03-12 2005-09-29 Adam Opel Ag Monolithic catalyst, to clean exhaust gases from an IC motor, has a carrier with parallel flow channels coated with a noble metal only at the section towards the inflow
DE102017205392A1 (en) 2017-03-30 2018-10-04 Audi Ag particulate Filter
CN114412622B (en) * 2022-03-29 2022-06-17 天津内燃机研究所（天津摩托车技术中心） Vehicle tail gas purification device

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10208872C1 (en) * 2002-03-01 2003-08-07 Emitec Emissionstechnologie Production of a honeycomb body comprises forming a jacketed tube made from a metal sheet, forming a hole next to a perforated edge in the metal sheet, applying a flange piece, placing the structure in the tube, and heat treating
US7765697B2 (en) 2002-03-01 2010-08-03 Emitec Gesellschaft Fuer Emissionstechnologie Mbh Process for producing a honeycomb body with a flange piece for a measurement sensor, and corresponding honeycomb body
US8649854B2 (en) 2008-02-06 2014-02-11 Capis Sprl Method and device for the determination of murmur frequency band
FR2945315A3 (en) * 2009-05-05 2010-11-12 Renault Sas Exhaust gas treating device i.e. particle filter, for engine of motor vehicle, has bars whose end face is located far away from common plane over entire extent of its section so as to form indention in inlet or outlet face of array
FR3091556A1 (en) * 2019-01-09 2020-07-10 Renault S.A.S vehicle depollution system
EP3680004A1 (en) * 2019-01-09 2020-07-15 RENAULT s.a.s. Pollution-control system of a vehicle

Also Published As

Publication number Publication date
ES2281385T3 (en) 2007-10-01
EP1158145A3 (en) 2005-09-28
DE10025076A1 (en) 2001-11-22
DE10025076B4 (en) 2008-04-30
DE50112217D1 (en) 2007-05-03
EP1158145B1 (en) 2007-03-21

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